Chapter 3
Hardware Overview
PCI-4451/4452/4453/4454 User Manual
3-2
www.ni.com
Figure 3-2.
PCI-4451/4452 Analog Function Block Diagram
A
C/DC
Coupling
MUX0
INPUT/CAL
MUX0
0 dB/20 dB
A
TTEN
MUX0
A
C/DC
Coupling
MUX1
INPUT/CAL
MUX1
0 dB/20 dB
A
TTEN
MUX1
ENABLE1
Analog Bus
Analog Mezzanine Bus (to Digital Section)
Ser
ial Data Manager
DIFF
Gain
AMP
ADC0
DIFF
Gain
AMP
ADC1
DIFF
Gain
AMP
ADC2
A
C/DC
Coupling
MUX2
INPUT/CAL
MUX2
0 dB/20 dB
A
TTEN
MUX2
DIFF
Gain
AMP
ADC3
A
C/DC
Coupling
MUX3
INPUT/CAL
MUX3
0 dB/20 dB
A
TTEN
MUX3
Analog
Ov
err
ange
Detect
Gain/Offset
Calibr
ation
A
C/DC
MUX
Control
INPUT/CAL
MUX
Control
A
TTEN
MUX
Control
Gain
Control
ADC Control
ADC Cloc
k
Manager
D
A
C Control
Atten
uation
Control
Output
Enab
le
DIFF
A
TTEN
AMP
D
A
C0
ENABLE0
Analog Bus
DIFF
A
TTEN
AMP
D
A
C1
Gain/Offset
Calibr
ation
Gener
al Control
Digital
Ov
err
ange
Detect
D
A
C Cloc
k
Manager
EEPR
OM
†
PCI-4452 only
††
PCI-4451 only
LP
Filter
LP
Filter
LP
Filter
LP
Filter
T
rigger
Control
††
††
†